Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2608ddea77f6ac…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 04:02:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 80eea235eafd652e5b07680d3f888b3b SHA-1: fbd4221432ea073464e66882945cb60ae8fb6386 SHA-256: 8a2608ddea77f6ac171cbc4e25bb86dcc707d5786ba134da87b03a73a41abcea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'game hacks' and 'free spins'. The ML classifier also flagged this PDF as malicious. The primary lure appears to be a 'daily free spin coin master link' which is a common social engineering tactic to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/daily-free-spin-coin-master-link-game-hack In PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-executor-roblox_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/pubg-uc-indonesia_GM1330123889.pdfIn PDF document text
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005165.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5165 24784 bytes
SHA-256: 0ce312c3207ae4230bf8e215ee7b99c4bd27f61730f5e3af758509bb85e938dd
font_01_sfnt_off0000891d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x891D 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9308 18476 bytes
SHA-256: 13087f23ced5a654764a402ace47e06b7ceeb886891228a443e0cb07dd9c4176

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